Method and apparatus for making magnesium-based alloy
a magnesium-based alloy and magnesium alloy technology, applied in the direction of furnaces, electric furnaces, furnace types, etc., can solve the problems of inability to meet the increasing needs of automotive and aerospace industries, inability to toughen and strengthen the magnesium alloy, and easy oxidation of magnesium metal or magnesium alloy,
Active Publication Date: 2010-11-02
TSINGHUA UNIV +1
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Benefits of technology
The patent describes a method and apparatus for making a magnesium-based alloy by mixing carbon nanotubes with magnesium particles and heating them to a semi-solid state. The mixture is then stirred to disperse the carbon nanotubes and injected into a die. The resulting alloy is cooled to solidify it. The technical effect of this method is the creation of a magnesium-based alloy with improved strength and ductility.
Problems solved by technology
However, the toughness and the strength of the magnesium alloy are not able to meet the increasing needs of the automotive and aerospace industries.
In thixo-molding, the nanoscale reinforcements are added to melted metal or alloy, causing the nanoscale reinforcements to have tendency to aggregate.
Therefore, the nanoscale reinforcements can't be uniformly dispersed therein.
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[0013]Reference will now be made to the drawings to describe, in detail, embodiments of the method and the apparatus for fabricating the magnesium-based alloy.
[0014]Referring to FIG. 1, an apparatus 100 for fabricating a magnesium-based alloy 8 includes a transferring device 3, a thixomolding machine 4, an electromagnetic stirring device 6, and an injection molding machine 7 arranged in alignment in that order. The transferring device 3 includes a feed inlet 31 with a conveyer portion 32 (i.e., a material input device) connected thereto. The feed inlet 31 includes a first feed inlet 311 and a second feed inlet 312 connected to the first feed inlet 311. The thixomolding machine 4 includes a heating barrel 44 and a nozzle 45. The heating barrel 44 has two ends opposite to each other. The nozzle 45 is disposed at a first end thereof. The conveyer portion 32 is positioned at a second end thereof. Further, the thixomolding machine 4 can also include a heating portion 41 disposed around a...
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Abstract
A method for fabricating a magnesium-based alloy includes the steps of: (a) mixing a number of carbon nanotubes with a number of magnesium particles; (b) heating the mixture in a protective gas to achieve a semi-solid-state paste; (c) stirring the semi-solid-paste using an electromagnetic stirring force to disperse the carbon nanotubes into the paste; (d) injecting the semi-solid-state paste into a die; and (e) cooling the semi-solid-state paste to achieve a magnesium-based alloy. An apparatus for fabricating the magnesium-based alloy includes a transferring device, a thixomolding machine, and an electromagnetic stirring device. The transferring device includes a feed inlet. The thixomolding machine includes a heating barrel having two ends, a nozzle disposed at a first end thereof, and an material input positioned at a second end thereof. The electromagnetic stirring device includes an electromagnetic induction coil disposed on an outer wall of the heating barrel.
Description
BACKGROUND[0001]1. Field of the Invention[0002]The present invention relates to methods and apparatuses for fabricating alloys and, particularly, to a method and an apparatus for fabricating a magnesium-based alloy.[0003]2. Discussion of Related Art[0004]Nowadays, alloys have been developed for special applications. Among these alloys, the magnesium alloy has some good properties, such as good wear resistance, and high elastic modulus. However, the toughness and the strength of the magnesium alloy are not able to meet the increasing needs of the automotive and aerospace industries.[0005]To address the above-described problems, magnesium-based alloys have been developed. In a magnesium-based alloy, nanoscale reinforcements (e.g. carbon nanotubes and carbon nanofibers) are added to the magnesium metal or alloy. The conventional methods for making the magnesium-based alloy are by thixo-molding and die-casting. However, in die-casting, the magnesium metal or magnesium alloy tend to be e...
Claims
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IPC IPC(8): C22B26/22C22B4/02
CPCB22F3/225C22C26/00B22F2999/00C22C2026/002B22F2202/05
Inventor CHAN, KAM-SHAUCHEN, CHENG-SHIZHANG, LI-QINGLI, WEN-ZHEN
Owner TSINGHUA UNIV